Vtorushina info 2.2018 | oilandgasgeology

Якорь 1

E.A. Vtorushina, T.D. Bulatov, I.V. Kozlov, M.N. Vtorushin

The advanced technique for determination of pyrolysis parameters of rocks

DOI: 10.31087/0016-7894-2018-2-71-77

The work objective was to select the optimal conditions to prepare samples for pyrolysis studies and evaluation of metrological characteristics of pyrolysis parameters determination using HAWK analyser(Hydrocarbon Analyzer With Kinetics, Wildcat Technologies, USA). Samples preparation to pyrolysis studies included milling, grinding, screening, and Soxhlet extraction by organic solvents. In order to select the optimal sample weight, the samples with S2 and TOC parameter values ranging from 0.18 to 300 mg HC/g of rock and 0.30 to 65 %wt, respectively, were analysed. Optimal range of sample weight was 30 to 50 mg. With a purpose to select the optimal conditions for extraction, effect of benzene, alcohol and benzene mixture (isopropanol / benzene = 1/4), toluene, and chloroform was tested. The most complete extraction was obtained with the use of chloroform and alcohol-benzene mixture for both source rocks and reservoir rocks; optimal duration of extraction from 2 to 3 g sample made 23 days. On the results of pyrolysis parameters determination on standard samples and real core samples having various Bazhenov-Abalak sequence maturity, which were taken in the Middle Ob territory, the metrological characteristics (ranges of values determined, repeatability, intermediate precision, and accuracy) were calculated and validated. Data on the analysis of standard samples coincide with the certified values within the reference accuracy. The results of interlaboratory comparative testing for pyrolysis parameters determination on real core samples using HAWK and Rock-Eval 6 are in good agreement.

Key words: pyrolysis; core; bitumen extraction; metrological characteristics; interlaboratory studies.

For citation: Vtorushina E.A., Bulatov T.D., Kozlov I.V., Vtorushin M.N. The advanced technique for determination of pyrolysis parameters of rocks. Geologiya nefti i gaza. 2018;(2):71–77. DOI: 10.31087/0016-7894-2018-2-71-77.

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